<template>
  <div class="vue-cropper" ref="cropper" @mouseover="scaleImg" @mouseout="cancelScale">
    <div class="cropper-box" v-if="imgs">
      <div
        class="cropper-box-canvas"
        v-show="!loading"
        :style="{
					'width': trueWidth + 'px',
					'height': trueHeight + 'px',
					'transform': 'scale(' + scale + ',' + scale + ') ' + 'translate3d('+ x / scale + 'px,' + y / scale + 'px,' + '0)'
					+ 'rotateZ('+ rotate * 90 +'deg)'
					}"
      >
        <img :src="imgs" alt="cropper-img" ref="cropperImg">
      </div>
    </div>
    <div
      class="cropper-drag-box"
      :class="{'cropper-move': move && !crop, 'cropper-crop': crop, 'cropper-modal': cropping}"
      @mousedown="startMove"
      @touchstart="startMove"
    ></div>
    <div
      v-show="cropping"
      class="cropper-crop-box"
      :style="{
					'width': cropW + 'px',
					'height': cropH + 'px',
					'transform': 'translate3d('+ cropOffsertX + 'px,' + cropOffsertY + 'px,' + '0)'
				}"
    >
      <span class="cropper-view-box">
        <img
          :style="{
						'width': trueWidth + 'px',
						'height': trueHeight + 'px',
						'transform': 'scale(' + scale + ',' + scale + ') ' + 'translate3d('+ (x - cropOffsertX) / scale  + 'px,' + (y - cropOffsertY) / scale + 'px,' + '0)'
						+ 'rotateZ('+ rotate * 90 +'deg)'
						}"
          :src="imgs"
          alt="cropper-img"
        >
      </span>
      <span class="cropper-face cropper-move" @mousedown="cropMove" @touchstart="cropMove"></span>
      <span
        class="crop-info"
        v-if="info"
        :style="{'top': cropInfo.top}"
      >{{ this.cropInfo.width }} × {{ this.cropInfo.height }}</span>
      <span v-if="!fixedBox">
        <span
          class="crop-line line-w"
          @mousedown="changeCropSize($event, false, true, 0, 1)"
          @touchstart="changeCropSize($event, false, true, 0, 1)"
        ></span>
        <span
          class="crop-line line-a"
          @mousedown="changeCropSize($event, true, false, 1, 0)"
          @touchstart="changeCropSize($event, true, false, 1, 0)"
        ></span>
        <span
          class="crop-line line-s"
          @mousedown="changeCropSize($event, false, true, 0, 2)"
          @touchstart="changeCropSize($event, false, true, 0, 2)"
        ></span>
        <span
          class="crop-line line-d"
          @mousedown="changeCropSize($event, true, false, 2, 0)"
          @touchstart="changeCropSize($event, true, false, 2, 0)"
        ></span>
        <span
          class="crop-point point1"
          @mousedown="changeCropSize($event, true, true, 1, 1)"
          @touchstart="changeCropSize($event, true, true, 1, 1)"
        ></span>
        <span
          class="crop-point point2"
          @mousedown="changeCropSize($event, false, true, 0, 1)"
          @touchstart="changeCropSize($event, false, true, 0, 1)"
        ></span>
        <span
          class="crop-point point3"
          @mousedown="changeCropSize($event, true, true, 2, 1)"
          @touchstart="changeCropSize($event, true, true, 2, 1)"
        ></span>
        <span
          class="crop-point point4"
          @mousedown="changeCropSize($event, true, false, 1, 0)"
          @touchstart="changeCropSize($event, true, false, 1, 0)"
        ></span>
        <span
          class="crop-point point5"
          @mousedown="changeCropSize($event, true, false, 2, 0)"
          @touchstart="changeCropSize($event, true, false, 2, 0)"
        ></span>
        <span
          class="crop-point point6"
          @mousedown="changeCropSize($event, true, true, 1, 2)"
          @touchstart="changeCropSize($event, true, true, 1, 2)"
        ></span>
        <span
          class="crop-point point7"
          @mousedown="changeCropSize($event, false, true, 0, 2)"
          @touchstart="changeCropSize($event, false, true, 0, 2)"
        ></span>
        <span
          class="crop-point point8"
          @mousedown="changeCropSize($event, true, true, 2, 2)"
          @touchstart="changeCropSize($event, true, true, 2, 2)"
        ></span>
      </span>
    </div>
  </div>
</template>

<script>
import exifmin from "./exif-js-min";

export default {
  data: function() {
    return {
      // 容器高宽
      w: 0,
      h: 0,
      // 图片缩放比例
      scale: 1,
      // 图片偏移x轴
      x: 0,
      // 图片偏移y轴
      y: 0,
      // 图片加载
      loading: true,
      // 图片真实宽度
      trueWidth: 0,
      // 图片真实高度
      trueHeight: 0,
      move: true,
      // 移动的x
      moveX: 0,
      // 移动的y
      moveY: 0,
      // 开启截图
      crop: false,
      // 正在截图
      cropping: false,
      // 裁剪框大小
      cropW: 0,
      cropH: 0,
      cropOldW: 0,
      cropOldH: 0,
      // 判断是否能够改变
      canChangeX: false,
      canChangeY: false,
      // 改变的基准点
      changeCropTypeX: 1,
      changeCropTypeY: 1,
      // 裁剪框的坐标轴
      cropX: 0,
      cropY: 0,
      cropChangeX: 0,
      cropChangeY: 0,
      cropOffsertX: 0,
      cropOffsertY: 0,
      // 支持的滚动事件
      support: "",
      // 移动端手指缩放
      touches: [],
      touchNow: false,
      // 图片旋转
      rotate: 0,
      isIos: false,
      orientation: 0,
      imgs: "",
      // 图片缩放系数
      coe: 0.2,
      // 是否正在多次缩放
      scaling: false,
      scalingSet: "",
      coeStatus: "",
      // 控制emit触发频率
      isCanShow: true
    };
  },
  props: {
    img: {
      type: [String, Blob, null, File],
      default: ""
    },
    // 输出图片压缩比
    outputSize: {
      type: Number,
      default: 1
    },
    outputType: {
      type: String,
      default: "jpeg"
    },
    info: {
      type: Boolean,
      default: true
    },
    // 是否开启滚轮放大缩小
    canScale: {
      type: Boolean,
      default: true
    },
    // 是否自成截图框
    autoCrop: {
      type: Boolean,
      default: false
    },
    autoCropWidth: {
      type: [Number, String],
      default: 0
    },
    autoCropHeight: {
      type: [Number, String],
      default: 0
    },
    // 是否开启固定宽高比
    fixed: {
      type: Boolean,
      default: false
    },
    // 宽高比 w/h
    fixedNumber: {
      type: Array,
      default: () => {
        return [1, 1];
      }
    },
    // 固定大小 禁止改变截图框大小
    fixedBox: {
      type: Boolean,
      default: false
    },
    // 输出截图是否缩放
    full: {
      type: Boolean,
      default: false
    },
    // 是否可以拖动图片
    canMove: {
      type: Boolean,
      default: true
    },
    // 是否可以拖动截图框
    canMoveBox: {
      type: Boolean,
      default: true
    },
    // 上传图片按照原始比例显示
    original: {
      type: Boolean,
      default: false
    },
    // 截图框能否超过图片
    centerBox: {
      type: Boolean,
      default: false
    },
    // 是否根据dpr输出高清图片
    high: {
      type: Boolean,
      default: true
    },
    // 截图框展示宽高类型
    infoTrue: {
      type: Boolean,
      default: false
    },
    // 可以压缩图片宽高  默认不超过200
    maxImgSize: {
      type: Number,
      default: 2000
    },
    // 倍数  可渲染当前截图框的n倍 0 - 1000;
    enlarge: {
      type: [Number, String],
      default: 1
    },

    // 自动预览的固定宽度
    preW: {
      type: [Number, String],
      default: 0
    },
    /*
      图片布局方式 mode 实现和css背景一样的效果
      contain  居中布局 默认不会缩放 保证图片在容器里面 mode: 'contain'
      cover    拉伸布局 填充整个容器  mode: 'cover'
      如果仅有一个数值被给定，这个数值将作为宽度值大小，高度值将被设定为auto。 mode: '50px'
      如果有两个数值被给定，第一个将作为宽度值大小，第二个作为高度值大小。 mode: '50px 60px'
    */
    mode: {
      type: String,
      default: "contain"
    },
    //限制最小区域,可传1以上的数字和字符串，限制长宽都是这么大
    // 也可以传数组[90,90] 
    limitMinSize: {
      type: [Number, Array, String],
      default: () => {
        return 10;
      }
    },
  },
  computed: {
    cropInfo() {
      let obj = {};
      obj.top = this.cropOffsertY > 21 ? "-21px" : "0px";
      obj.width = this.cropW > 0 ? this.cropW : 0;
      obj.height = this.cropH > 0 ? this.cropH : 0;
      if (this.infoTrue) {
        let dpr = 1;
        if (this.high && !this.full) {
          dpr = window.devicePixelRatio;
        }
        if ((this.enlarge !== 1) & !this.full) {
          dpr = Math.abs(Number(this.enlarge));
        }
        obj.width = obj.width * dpr;
        obj.height = obj.height * dpr;
        if (this.full) {
          obj.width = obj.width / this.scale;
          obj.height = obj.height / this.scale;
        }
      }
      obj.width = obj.width.toFixed(0);
      obj.height = obj.height.toFixed(0);
      return obj;
    },

    isIE() {
      var userAgent = navigator.userAgent; //取得浏览器的userAgent字符串
      const isIE = !!window.ActiveXObject || 'ActiveXObject' in window; //判断是否IE浏览器
      return isIE;
    },

    passive () {
      return this.isIE ? null : {
        passive: false
      }
    }
  },
  watch: {
    // 如果图片改变， 重新布局
    img() {
      // 当传入图片时, 读取图片信息同时展示
      this.checkedImg();
    },
    imgs(val) {
      if (val === "") {
        return;
      }
      this.reload();
    },
    cropW() {
      this.showPreview();
    },
    cropH() {
      this.showPreview();
    },
    cropOffsertX() {
      this.showPreview();
    },
    cropOffsertY() {
      this.showPreview();
    },
    scale(val, oldVal) {
      this.showPreview();
    },
    x() {
      this.showPreview();
    },
    y() {
      this.showPreview();
    },
    autoCrop(val) {
      if (val) {
        this.goAutoCrop();
      }
    },
    // 修改了自动截图框
    autoCropWidth() {
      if (this.autoCrop) {
        this.goAutoCrop();
      }
    },
    autoCropHeight() {
      if (this.autoCrop) {
        this.goAutoCrop();
      }
    },
    mode() {
      this.checkedImg();
    },
    rotate() {
      this.showPreview();
      if (this.autoCrop) {
        this.goAutoCrop(this.cropW, this.cropH);
      } else {
        if (this.cropW > 0 || this.cropH > 0) {
          this.goAutoCrop(this.cropW, this.cropH);
        }
      }
    }
  },
  methods: {
    checkOrientationImage(img, orientation, width, height) {
      let canvas = document.createElement("canvas");
      let ctx = canvas.getContext("2d");
      ctx.save();

      switch (orientation) {
        case 2:
          canvas.width = width;
          canvas.height = height;
          // horizontal flip
          ctx.translate(width, 0);
          ctx.scale(-1, 1);
          break;
        case 3:
          canvas.width = width;
          canvas.height = height;
          //180 graus
          ctx.translate(width / 2, height / 2);
          ctx.rotate((180 * Math.PI) / 180);
          ctx.translate(-width / 2, -height / 2);
          break;
        case 4:
          canvas.width = width;
          canvas.height = height;
          // vertical flip
          ctx.translate(0, height);
          ctx.scale(1, -1);
          break;
        case 5:
          // vertical flip + 90 rotate right
          canvas.height = width;
          canvas.width = height;
          ctx.rotate(0.5 * Math.PI);
          ctx.scale(1, -1);
          break;
        case 6:
          canvas.width = height;
          canvas.height = width;
          //90 graus
          ctx.translate(height / 2, width / 2);
          ctx.rotate((90 * Math.PI) / 180);
          ctx.translate(-width / 2, -height / 2);
          break;
        case 7:
          // horizontal flip + 90 rotate right
          canvas.height = width;
          canvas.width = height;
          ctx.rotate(0.5 * Math.PI);
          ctx.translate(width, -height);
          ctx.scale(-1, 1);
          break;
        case 8:
          canvas.height = width;
          canvas.width = height;
          //-90 graus
          ctx.translate(height / 2, width / 2);
          ctx.rotate((-90 * Math.PI) / 180);
          ctx.translate(-width / 2, -height / 2);
          break;
        default:
          canvas.width = width;
          canvas.height = height;
      }

      ctx.drawImage(img, 0, 0, width, height);
      ctx.restore();
      canvas.toBlob(
        blob => {
          let data = URL.createObjectURL(blob);
          URL.revokeObjectURL(this.imgs)
          this.imgs = data;
        },
        "image/" + this.outputType,
        1
      );
    },

    // checkout img
    checkedImg() {
      if (this.img === null || this.img === '') {
        this.imgs = ''
        this.clearCrop()
        return
      }
      this.loading = true;
      this.scale = 1;
      this.rotate = 0;
      this.clearCrop();
      let img = new Image();
      img.onload = () => {
        if (this.img === "") {
          this.$emit("imgLoad", "error");
          this.$emit("img-load", "error");
          return false;
        }

        let width = img.width;
        let height = img.height;
        exifmin.getData(img).then(data => {
          this.orientation = data.orientation || 1;
          let max = this.maxImgSize;
          if (!this.orientation && (width < max) & (height < max)) {
            this.imgs = this.img;
            return;
          }

          if (width > max) {
            height = (height / width) * max;
            width = max;
          }

          if (height > max) {
            width = (width / height) * max;
            height = max;
          }

          this.checkOrientationImage(img, this.orientation, width, height);
        });
      };

      img.onerror = () => {
        this.$emit("imgLoad", "error");
        this.$emit("img-load", "error");
      };

      // 判断如果不是base64图片 再添加crossOrigin属性，否则会导致iOS低版本(10.2)无法显示图片
      if (this.img.substr(0, 4) !== "data") {
        img.crossOrigin = "";
      }

      if (this.isIE) {
        var xhr = new XMLHttpRequest();
        xhr.onload = function() {
          var url = URL.createObjectURL(this.response);
          img.src = url;
        };
        xhr.open("GET", this.img, true);
        xhr.responseType = "blob";
        xhr.send();
      } else {
        img.src = this.img;
      }
    },
    // 当按下鼠标键
    startMove(e) {
      e.preventDefault();
      // 如果move 为true 表示当前可以拖动
      if (this.move && !this.crop) {
        if (!this.canMove) {
          return false;
        }
        // 开始移动
        this.moveX = (e.clientX ? e.clientX : e.touches[0].clientX) - this.x;
        this.moveY = (e.clientY ? e.clientY : e.touches[0].clientY) - this.y;
        if (e.touches) {
          window.addEventListener("touchmove", this.moveImg);
          window.addEventListener("touchend", this.leaveImg);
          if (e.touches.length == 2) {
            // 记录手指刚刚放上去
            this.touches = e.touches;
            window.addEventListener("touchmove", this.touchScale);
            window.addEventListener("touchend", this.cancelTouchScale);
          }
        } else {
          window.addEventListener("mousemove", this.moveImg);
          window.addEventListener("mouseup", this.leaveImg);
        }
        // 触发图片移动事件
        this.$emit("imgMoving", {
          moving: true,
          axis: this.getImgAxis()
        });
        this.$emit("img-moving", {
          moving: true,
          axis: this.getImgAxis()
        });
      } else {
        // 截图ing
        this.cropping = true;
        // 绑定截图事件
        window.addEventListener("mousemove", this.createCrop);
        window.addEventListener("mouseup", this.endCrop);
        window.addEventListener("touchmove", this.createCrop);
        window.addEventListener("touchend", this.endCrop);
        this.cropOffsertX = e.offsetX
          ? e.offsetX
          : e.touches[0].pageX - this.$refs.cropper.offsetLeft;
        this.cropOffsertY = e.offsetY
          ? e.offsetY
          : e.touches[0].pageY - this.$refs.cropper.offsetTop;
        this.cropX = e.clientX ? e.clientX : e.touches[0].clientX;
        this.cropY = e.clientY ? e.clientY : e.touches[0].clientY;
        this.cropChangeX = this.cropOffsertX;
        this.cropChangeY = this.cropOffsertY;
        this.cropW = 0;
        this.cropH = 0;
      }
    },

    // 移动端缩放
    touchScale(e) {
      e.preventDefault();
      let scale = this.scale;
      // 记录变化量
      // 第一根手指
      var oldTouch1 = {
        x: this.touches[0].clientX,
        y: this.touches[0].clientY
      };
      var newTouch1 = {
        x: e.touches[0].clientX,
        y: e.touches[0].clientY
      };
      // 第二根手指
      var oldTouch2 = {
        x: this.touches[1].clientX,
        y: this.touches[1].clientY
      };
      var newTouch2 = {
        x: e.touches[1].clientX,
        y: e.touches[1].clientY
      };
      var oldL = Math.sqrt(
        Math.pow(oldTouch1.x - oldTouch2.x, 2) +
          Math.pow(oldTouch1.y - oldTouch2.y, 2)
      );
      var newL = Math.sqrt(
        Math.pow(newTouch1.x - newTouch2.x, 2) +
          Math.pow(newTouch1.y - newTouch2.y, 2)
      );
      var cha = newL - oldL;
      // 根据图片本身大小 决定每次改变大小的系数, 图片越大系数越小
      // 1px - 0.2
      var coe = 1;
      coe =
        coe / this.trueWidth > coe / this.trueHeight
          ? coe / this.trueHeight
          : coe / this.trueWidth;
      coe = coe > 0.1 ? 0.1 : coe;
      var num = coe * cha;
      if (!this.touchNow) {
        this.touchNow = true;
        if (cha > 0) {
          scale += Math.abs(num);
        } else if (cha < 0) {
          scale > Math.abs(num) ? (scale -= Math.abs(num)) : scale;
        }
        this.touches = e.touches;
        setTimeout(() => {
          this.touchNow = false;
        }, 8);
        if (!this.checkoutImgAxis(this.x, this.y, scale)) {
          return false;
        }
        this.scale = scale;
      }
    },

    cancelTouchScale(e) {
      window.removeEventListener("touchmove", this.touchScale);
    },

    // 移动图片
    moveImg(e) {
      e.preventDefault();
      if (e.touches && e.touches.length === 2) {
        this.touches = e.touches;
        window.addEventListener("touchmove", this.touchScale);
        window.addEventListener("touchend", this.cancelTouchScale);
        window.removeEventListener("touchmove", this.moveImg);
        return false;
      }
      let nowX = e.clientX ? e.clientX : e.touches[0].clientX;
      let nowY = e.clientY ? e.clientY : e.touches[0].clientY;

      let changeX, changeY;
      changeX = nowX - this.moveX;
      changeY = nowY - this.moveY;

      this.$nextTick(() => {
        if (this.centerBox) {
          let axis = this.getImgAxis(changeX, changeY, this.scale);
          let cropAxis = this.getCropAxis();
          let imgW = this.trueHeight * this.scale;
          let imgH = this.trueWidth * this.scale;
          let maxLeft, maxTop, maxRight, maxBottom;
          switch (this.rotate) {
            case 1:
            case -1:
            case 3:
            case -3:
              maxLeft =
                this.cropOffsertX -
                (this.trueWidth * (1 - this.scale)) / 2 +
                (imgW - imgH) / 2;
              maxTop =
                this.cropOffsertY -
                (this.trueHeight * (1 - this.scale)) / 2 +
                (imgH - imgW) / 2;
              maxRight = maxLeft - imgW + this.cropW;
              maxBottom = maxTop - imgH + this.cropH;
              break;
            default:
              maxLeft =
                this.cropOffsertX - (this.trueWidth * (1 - this.scale)) / 2;
              maxTop =
                this.cropOffsertY - (this.trueHeight * (1 - this.scale)) / 2;
              maxRight = maxLeft - imgH + this.cropW;
              maxBottom = maxTop - imgW + this.cropH;
              break;
          }

          // 图片左边 图片不能超过截图框
          if (axis.x1 >= cropAxis.x1) {
            changeX = maxLeft;
          }

          // 图片上边 图片不能超过截图框
          if (axis.y1 >= cropAxis.y1) {
            changeY = maxTop;
          }

          // 图片右边
          if (axis.x2 <= cropAxis.x2) {
            changeX = maxRight;
          }

          // 图片下边
          if (axis.y2 <= cropAxis.y2) {
            changeY = maxBottom;
          }
        }
        this.x = changeX;
        this.y = changeY;
        // 触发图片移动事件
        this.$emit("imgMoving", {
          moving: true,
          axis: this.getImgAxis()
        });
        this.$emit("img-moving", {
          moving: true,
          axis: this.getImgAxis()
        });
      });
    },
    // 移动图片结束
    leaveImg(e) {
      window.removeEventListener("mousemove", this.moveImg);
      window.removeEventListener("touchmove", this.moveImg);
      window.removeEventListener("mouseup", this.leaveImg);
      window.removeEventListener("touchend", this.leaveImg);
      // 触发图片移动事件
      this.$emit("imgMoving", {
        moving: false,
        axis: this.getImgAxis()
      });
      this.$emit("img-moving", {
        moving: false,
        axis: this.getImgAxis()
      });
    },
    // 缩放图片
    scaleImg() {
      if (this.canScale) {
        window.addEventListener(this.support, this.changeSize, this.passive);
      }
    },
    // 移出框
    cancelScale() {
      if (this.canScale) {
        window.removeEventListener(this.support, this.changeSize);
      }
    },
    // 改变大小函数
    changeSize(e) {
      e.preventDefault();
      let scale = this.scale;
      var change = e.deltaY || e.wheelDelta;
      // 根据图片本身大小 决定每次改变大小的系数, 图片越大系数越小
      var isFirefox = navigator.userAgent.indexOf("Firefox");
      change = isFirefox > 0 ? change * 30 : change;
      // 修复ie的滚动缩放
      if (this.isIE) {
        change = -change;
      }
      // 1px - 0.2
      var coe = this.coe;
      coe =
        coe / this.trueWidth > coe / this.trueHeight
          ? coe / this.trueHeight
          : coe / this.trueWidth;
      var num = coe * change;
      num < 0
        ? (scale += Math.abs(num))
        : scale > Math.abs(num)
        ? (scale -= Math.abs(num))
        : scale;
      // 延迟0.1s 每次放大大或者缩小的范围
      let status = num < 0 ? "add" : "reduce";
      if (status !== this.coeStatus) {
        this.coeStatus = status;
        this.coe = 0.2;
      }
      if (!this.scaling) {
        this.scalingSet = setTimeout(() => {
          this.scaling = false;
          this.coe = this.coe += 0.01;
        }, 50);
      }
      this.scaling = true;
      if (!this.checkoutImgAxis(this.x, this.y, scale)) {
        return false;
      }
      this.scale = scale;
    },

    // 修改图片大小函数
    changeScale(num) {
      let scale = this.scale;
      num = num || 1;
      var coe = 20;
      coe =
        coe / this.trueWidth > coe / this.trueHeight
          ? coe / this.trueHeight
          : coe / this.trueWidth;
      num = num * coe;
      num > 0
        ? (scale += Math.abs(num))
        : scale > Math.abs(num)
        ? (scale -= Math.abs(num))
        : scale;
      if (!this.checkoutImgAxis(this.x, this.y, scale)) {
        return false;
      }
      this.scale = scale;
    },
    // 创建截图框
    createCrop(e) {
      e.preventDefault();
      // 移动生成大小
      var nowX = e.clientX ? e.clientX : e.touches ? e.touches[0].clientX : 0;
      var nowY = e.clientY ? e.clientY : e.touches ? e.touches[0].clientY : 0;
      this.$nextTick(() => {
        var fw = nowX - this.cropX;
        var fh = nowY - this.cropY;
        if (fw > 0) {
          this.cropW =
            fw + this.cropChangeX > this.w ? this.w - this.cropChangeX : fw;
          this.cropOffsertX = this.cropChangeX;
        } else {
          this.cropW =
            this.w - this.cropChangeX + Math.abs(fw) > this.w
              ? this.cropChangeX
              : Math.abs(fw);
          this.cropOffsertX =
            this.cropChangeX + fw > 0 ? this.cropChangeX + fw : 0;
        }

        if (!this.fixed) {
          if (fh > 0) {
            this.cropH =
              fh + this.cropChangeY > this.h ? this.h - this.cropChangeY : fh;
            this.cropOffsertY = this.cropChangeY;
          } else {
            this.cropH =
              this.h - this.cropChangeY + Math.abs(fh) > this.h
                ? this.cropChangeY
                : Math.abs(fh);
            this.cropOffsertY =
              this.cropChangeY + fh > 0 ? this.cropChangeY + fh : 0;
          }
        } else {
          var fixedHeight =
            (this.cropW / this.fixedNumber[0]) * this.fixedNumber[1];
          if (fixedHeight + this.cropOffsertY > this.h) {
            this.cropH = this.h - this.cropOffsertY;
            this.cropW =
              (this.cropH / this.fixedNumber[1]) * this.fixedNumber[0];
            if (fw > 0) {
              this.cropOffsertX = this.cropChangeX;
            } else {
              this.cropOffsertX = this.cropChangeX - this.cropW;
            }
          } else {
            this.cropH = fixedHeight;
          }
          this.cropOffsertY = this.cropOffsertY;
        }
      });
    },

    // 改变截图框大小
    changeCropSize(e, w, h, typeW, typeH) {
      e.preventDefault();
      window.addEventListener("mousemove", this.changeCropNow);
      window.addEventListener("mouseup", this.changeCropEnd);
      window.addEventListener("touchmove", this.changeCropNow);
      window.addEventListener("touchend", this.changeCropEnd);
      this.canChangeX = w;
      this.canChangeY = h;
      this.changeCropTypeX = typeW;
      this.changeCropTypeY = typeH;
      this.cropX = e.clientX ? e.clientX : e.touches[0].clientX;
      this.cropY = e.clientY ? e.clientY : e.touches[0].clientY;
      this.cropOldW = this.cropW;
      this.cropOldH = this.cropH;
      this.cropChangeX = this.cropOffsertX;
      this.cropChangeY = this.cropOffsertY;
      if (this.fixed) {
        if (this.canChangeX && this.canChangeY) {
          this.canChangeY = 0;
        }
      }
      this.$emit('change-crop-size', {
        width: this.cropW,
        height: this.cropH
      })
    },

    // 正在改变
    changeCropNow(e) {
      e.preventDefault();
      var nowX = e.clientX ? e.clientX : e.touches ? e.touches[0].clientX : 0;
      var nowY = e.clientY ? e.clientY : e.touches ? e.touches[0].clientY : 0;
      // 容器的宽高
      let wrapperW = this.w;
      let wrapperH = this.h;

      // 不能超过的坐标轴
      let minX = 0;
      let minY = 0;

      if (this.centerBox) {
        let axis = this.getImgAxis();
        let imgW = axis.x2;
        let imgH = axis.y2;
        minX = axis.x1 > 0 ? axis.x1 : 0;
        minY = axis.y1 > 0 ? axis.y1 : 0;
        if (wrapperW > imgW) {
          wrapperW = imgW;
        }

        if (wrapperH > imgH) {
          wrapperH = imgH;
        }
      }

      this.$nextTick(() => {
        var fw = nowX - this.cropX;
        var fh = nowY - this.cropY;
        if (this.canChangeX) {
          if (this.changeCropTypeX === 1) {
            if (this.cropOldW - fw > 0) {
              this.cropW =
                wrapperW - this.cropChangeX - fw <= wrapperW - minX
                  ? this.cropOldW - fw
                  : this.cropOldW + this.cropChangeX - minX;
              this.cropOffsertX =
                wrapperW - this.cropChangeX - fw <= wrapperW - minX
                  ? this.cropChangeX + fw
                  : minX;
            } else {
              this.cropW =
                Math.abs(fw) + this.cropChangeX <= wrapperW
                  ? Math.abs(fw) - this.cropOldW
                  : wrapperW - this.cropOldW - this.cropChangeX;
              this.cropOffsertX = this.cropChangeX + this.cropOldW;
            }
          } else if (this.changeCropTypeX === 2) {
            if (this.cropOldW + fw > 0) {
              this.cropW =
                this.cropOldW + fw + this.cropOffsertX <= wrapperW
                  ? this.cropOldW + fw
                  : wrapperW - this.cropOffsertX;
              this.cropOffsertX = this.cropChangeX;
            } else {
              // 右侧坐标抽 超过左侧
              this.cropW =
                wrapperW - this.cropChangeX + Math.abs(fw + this.cropOldW) <=
                wrapperW - minX
                  ? Math.abs(fw + this.cropOldW)
                  : this.cropChangeX - minX;
              this.cropOffsertX =
                wrapperW - this.cropChangeX + Math.abs(fw + this.cropOldW) <=
                wrapperW - minX
                  ? this.cropChangeX - Math.abs(fw + this.cropOldW)
                  : minX;
            }
          }
        }

        if (this.canChangeY) {
          if (this.changeCropTypeY === 1) {
            if (this.cropOldH - fh > 0) {
              this.cropH =
                wrapperH - this.cropChangeY - fh <= wrapperH - minY
                  ? this.cropOldH - fh
                  : this.cropOldH + this.cropChangeY - minY;
              this.cropOffsertY =
                wrapperH - this.cropChangeY - fh <= wrapperH - minY
                  ? this.cropChangeY + fh
                  : minY;
            } else {
              this.cropH =
                Math.abs(fh) + this.cropChangeY <= wrapperH
                  ? Math.abs(fh) - this.cropOldH
                  : wrapperH - this.cropOldH - this.cropChangeY;
              this.cropOffsertY = this.cropChangeY + this.cropOldH;
            }
          } else if (this.changeCropTypeY === 2) {
            if (this.cropOldH + fh > 0) {
              this.cropH =
                this.cropOldH + fh + this.cropOffsertY <= wrapperH
                  ? this.cropOldH + fh
                  : wrapperH - this.cropOffsertY;
              this.cropOffsertY = this.cropChangeY;
            } else {
              this.cropH =
                wrapperH - this.cropChangeY + Math.abs(fh + this.cropOldH) <=
                wrapperH - minY
                  ? Math.abs(fh + this.cropOldH)
                  : this.cropChangeY - minY;
              this.cropOffsertY =
                wrapperH - this.cropChangeY + Math.abs(fh + this.cropOldH) <=
                wrapperH - minY
                  ? this.cropChangeY - Math.abs(fh + this.cropOldH)
                  : minY;
            }
          }
        }

        if (this.canChangeX && this.fixed) {
          var fixedHeight =
            (this.cropW / this.fixedNumber[0]) * this.fixedNumber[1];
          if (fixedHeight + this.cropOffsertY > wrapperH) {
            this.cropH = wrapperH - this.cropOffsertY;
            this.cropW =
              (this.cropH / this.fixedNumber[1]) * this.fixedNumber[0];
          } else {
            this.cropH = fixedHeight;
          }
        }

        if (this.canChangeY && this.fixed) {
          var fixedWidth =
            (this.cropH / this.fixedNumber[1]) * this.fixedNumber[0];
          if (fixedWidth + this.cropOffsertX > wrapperW) {
            this.cropW = wrapperW - this.cropOffsertX;
            this.cropH =
              (this.cropW / this.fixedNumber[0]) * this.fixedNumber[1];
          } else {
            this.cropW = fixedWidth;
          }
        }
      });
    },

    checkCropLimitSize () {
      let { cropW, cropH, limitMinSize } = this;

      let limitMinNum = new Array;
      if (!Array.isArray[limitMinSize]) {
        limitMinNum = [limitMinSize, limitMinSize]
      } else {
        limitMinNum = limitMinSize
      }
      
      //限制最小宽度和高度
      cropW = parseFloat(limitMinNum[0])
      cropH = parseFloat(limitMinNum[1])
      return [cropW, cropH]
    },
    // 结束改变
    changeCropEnd(e) {
      window.removeEventListener("mousemove", this.changeCropNow);
      window.removeEventListener("mouseup", this.changeCropEnd);
      window.removeEventListener("touchmove", this.changeCropNow);
      window.removeEventListener("touchend", this.changeCropEnd);
    },

    // 创建完成
    endCrop() {
      if (this.cropW === 0 && this.cropH === 0) {
        this.cropping = false;
      }
      window.removeEventListener("mousemove", this.createCrop);
      window.removeEventListener("mouseup", this.endCrop);
      window.removeEventListener("touchmove", this.createCrop);
      window.removeEventListener("touchend", this.endCrop);
    },
    // 开始截图
    startCrop() {
      this.crop = true;
      // console.log('开始截图')
    },
    // 停止截图
    stopCrop() {
      this.crop = false;
      // console.log('停止截图')
    },
    // 清除截图
    clearCrop() {
      this.cropping = false;
      this.cropW = 0;
      this.cropH = 0;
      // console.log('清除截图')
    },
    // 截图移动
    cropMove(e) {
      e.preventDefault();
      if (!this.canMoveBox) {
        this.crop = false;
        this.startMove(e);
        return false;
      }

      if (e.touches && e.touches.length === 2) {
        this.crop = false;
        this.startMove(e);
        this.leaveCrop();
        return false;
      }
      window.addEventListener("mousemove", this.moveCrop);
      window.addEventListener("mouseup", this.leaveCrop);
      window.addEventListener("touchmove", this.moveCrop);
      window.addEventListener("touchend", this.leaveCrop);
      let x = e.clientX ? e.clientX : e.touches[0].clientX;
      let y = e.clientY ? e.clientY : e.touches[0].clientY;
      let newX, newY;
      newX = x - this.cropOffsertX;
      newY = y - this.cropOffsertY;
      this.cropX = newX;
      this.cropY = newY;
      // 触发截图框移动事件
      this.$emit("cropMoving", {
        moving: true,
        axis: this.getCropAxis()
      });
      this.$emit("crop-moving", {
        moving: true,
        axis: this.getCropAxis()
      });
    },

    moveCrop(e, isMove) {
      let nowX = 0;
      let nowY = 0;
      if (e) {
        e.preventDefault();
        nowX = e.clientX ? e.clientX : e.touches[0].clientX;
        nowY = e.clientY ? e.clientY : e.touches[0].clientY;
      }
      this.$nextTick(() => {
        let cx, cy;
        let fw = nowX - this.cropX;
        let fh = nowY - this.cropY;
        if (isMove) {
          fw = this.cropOffsertX;
          fh = this.cropOffsertY;
        }
        // 不能超过外层容器
        if (fw <= 0) {
          cx = 0;
        } else if (fw + this.cropW > this.w) {
          cx = this.w - this.cropW;
        } else {
          cx = fw;
        }

        if (fh <= 0) {
          cy = 0;
        } else if (fh + this.cropH > this.h) {
          cy = this.h - this.cropH;
        } else {
          cy = fh;
        }

        // 不能超过图片
        if (this.centerBox) {
          let axis = this.getImgAxis();
          // 横坐标判断
          if (cx <= axis.x1) {
            cx = axis.x1;
          }

          if (cx + this.cropW > axis.x2) {
            cx = axis.x2 - this.cropW;
          }

          // 纵坐标纵轴
          if (cy <= axis.y1) {
            cy = axis.y1;
          }

          if (cy + this.cropH > axis.y2) {
            cy = axis.y2 - this.cropH;
          }
        }

        this.cropOffsertX = cx;
        this.cropOffsertY = cy;

        // 触发截图框移动事件
        this.$emit("cropMoving", {
          moving: true,
          axis: this.getCropAxis()
        });
        this.$emit("crop-moving", {
          moving: true,
          axis: this.getCropAxis()
        });
      });
    },

    // 算出不同场景下面 图片相对于外层容器的坐标轴
    getImgAxis(x, y, scale) {
      x = x || this.x;
      y = y || this.y;
      scale = scale || this.scale;
      // 如果设置了截图框在图片内， 那么限制截图框不能超过图片的坐标
      // 图片的坐标
      let obj = {
        x1: 0,
        x2: 0,
        y1: 0,
        y2: 0
      };
      let imgW = this.trueWidth * scale;
      let imgH = this.trueHeight * scale;
      switch (this.rotate) {
        case 0:
          obj.x1 = x + (this.trueWidth * (1 - scale)) / 2;
          obj.x2 = obj.x1 + this.trueWidth * scale;
          obj.y1 = y + (this.trueHeight * (1 - scale)) / 2;
          obj.y2 = obj.y1 + this.trueHeight * scale;
          break;
        case 1:
        case -1:
        case 3:
        case -3:
          obj.x1 = x + (this.trueWidth * (1 - scale)) / 2 + (imgW - imgH) / 2;
          obj.x2 = obj.x1 + this.trueHeight * scale;
          obj.y1 = y + (this.trueHeight * (1 - scale)) / 2 + (imgH - imgW) / 2;
          obj.y2 = obj.y1 + this.trueWidth * scale;
          break;
        default:
          obj.x1 = x + (this.trueWidth * (1 - scale)) / 2;
          obj.x2 = obj.x1 + this.trueWidth * scale;
          obj.y1 = y + (this.trueHeight * (1 - scale)) / 2;
          obj.y2 = obj.y1 + this.trueHeight * scale;
          break;
      }
      return obj;
    },

    // 获取截图框的坐标轴
    getCropAxis() {
      let obj = {
        x1: 0,
        x2: 0,
        y1: 0,
        y2: 0
      };
      obj.x1 = this.cropOffsertX;
      obj.x2 = obj.x1 + this.cropW;
      obj.y1 = this.cropOffsertY;
      obj.y2 = obj.y1 + this.cropH;
      return obj;
    },

    leaveCrop(e) {
      window.removeEventListener("mousemove", this.moveCrop);
      window.removeEventListener("mouseup", this.leaveCrop);
      window.removeEventListener("touchmove", this.moveCrop);
      window.removeEventListener("touchend", this.leaveCrop);
      // 触发截图框移动事件
      this.$emit("cropMoving", {
        moving: false,
        axis: this.getCropAxis()
      });
      this.$emit("crop-moving", {
        moving: false,
        axis: this.getCropAxis()
      });
    },

    getCropChecked(cb) {
      let canvas = document.createElement("canvas");
      let img = new Image();
      let rotate = this.rotate;
      let trueWidth = this.trueWidth;
      let trueHeight = this.trueHeight;
      let cropOffsertX = this.cropOffsertX;
      let cropOffsertY = this.cropOffsertY;
      img.onload = () => {
        if (this.cropW !== 0) {
          let ctx = canvas.getContext("2d");
          let dpr = 1;
          if (this.high & !this.full) {
            dpr = window.devicePixelRatio;
          }
          if ((this.enlarge !== 1) & !this.full) {
            dpr = Math.abs(Number(this.enlarge));
            console.log(dpr);
          }
          let width = this.cropW * dpr;
          let height = this.cropH * dpr;
          let imgW = trueWidth * this.scale * dpr;
          let imgH = trueHeight * this.scale * dpr;
          // 图片x轴偏移
          let dx =
            (this.x - cropOffsertX + (this.trueWidth * (1 - this.scale)) / 2) *
            dpr;
          // 图片y轴偏移
          let dy =
            (this.y - cropOffsertY + (this.trueHeight * (1 - this.scale)) / 2) *
            dpr;
          // console.log(dx, dy)
          //保存状态
          setCanvasSize(width, height);
          ctx.save();
          switch (rotate) {
            case 0:
              if (!this.full) {
                ctx.drawImage(img, dx, dy, imgW, imgH);
              } else {
                // 输出原图比例截图
                setCanvasSize(width / this.scale, height / this.scale);
                ctx.drawImage(
                  img,
                  dx / this.scale,
                  dy / this.scale,
                  imgW / this.scale,
                  imgH / this.scale
                );
              }
              break;
            case 1:
            case -3:
              if (!this.full) {
                // 换算图片旋转后的坐标弥补
                dx = dx + (imgW - imgH) / 2;
                dy = dy + (imgH - imgW) / 2;
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                ctx.drawImage(img, dy, -dx - imgH, imgW, imgH);
              } else {
                setCanvasSize(width / this.scale, height / this.scale);
                // 换算图片旋转后的坐标弥补
                dx =
                  dx / this.scale + (imgW / this.scale - imgH / this.scale) / 2;
                dy =
                  dy / this.scale + (imgH / this.scale - imgW / this.scale) / 2;
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                ctx.drawImage(
                  img,
                  dy,
                  -dx - imgH / this.scale,
                  imgW / this.scale,
                  imgH / this.scale
                );
              }
              break;
            case 2:
            case -2:
              if (!this.full) {
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                ctx.drawImage(img, -dx - imgW, -dy - imgH, imgW, imgH);
              } else {
                setCanvasSize(width / this.scale, height / this.scale);
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                dx = dx / this.scale;
                dy = dy / this.scale;
                ctx.drawImage(
                  img,
                  -dx - imgW / this.scale,
                  -dy - imgH / this.scale,
                  imgW / this.scale,
                  imgH / this.scale
                );
              }
              break;
            case 3:
            case -1:
              if (!this.full) {
                // 换算图片旋转后的坐标弥补
                dx = dx + (imgW - imgH) / 2;
                dy = dy + (imgH - imgW) / 2;
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                ctx.drawImage(img, -dy - imgW, dx, imgW, imgH);
              } else {
                setCanvasSize(width / this.scale, height / this.scale);
                // 换算图片旋转后的坐标弥补
                dx =
                  dx / this.scale + (imgW / this.scale - imgH / this.scale) / 2;
                dy =
                  dy / this.scale + (imgH / this.scale - imgW / this.scale) / 2;
                ctx.rotate((rotate * 90 * Math.PI) / 180);
                ctx.drawImage(
                  img,
                  -dy - imgW / this.scale,
                  dx,
                  imgW / this.scale,
                  imgH / this.scale
                );
              }
              break;
            default:
              if (!this.full) {
                ctx.drawImage(img, dx, dy, imgW, imgH);
              } else {
                // 输出原图比例截图
                setCanvasSize(width / this.scale, height / this.scale);
                ctx.drawImage(
                  img,
                  dx / this.scale,
                  dy / this.scale,
                  imgW / this.scale,
                  imgH / this.scale
                );
              }
          }
          ctx.restore();
        } else {
          let width = trueWidth * this.scale;
          let height = trueHeight * this.scale;
          let ctx = canvas.getContext("2d");
          ctx.save();
          switch (rotate) {
            case 0:
              setCanvasSize(width, height);
              ctx.drawImage(img, 0, 0, width, height);
              break;
            case 1:
            case -3:
              // 旋转90度 或者-270度 宽度和高度对调
              setCanvasSize(height, width);
              ctx.rotate((rotate * 90 * Math.PI) / 180);
              ctx.drawImage(img, 0, -height, width, height);
              break;
            case 2:
            case -2:
              setCanvasSize(width, height);
              ctx.rotate((rotate * 90 * Math.PI) / 180);
              ctx.drawImage(img, -width, -height, width, height);
              break;
            case 3:
            case -1:
              setCanvasSize(height, width);
              ctx.rotate((rotate * 90 * Math.PI) / 180);
              ctx.drawImage(img, -width, 0, width, height);
              break;
            default:
              setCanvasSize(width, height);
              ctx.drawImage(img, 0, 0, width, height);
          }
          ctx.restore();
        }
        cb(canvas);
      };
      // 判断图片是否是base64
      var s = this.img.substr(0, 4);
      if (s !== "data") {
        img.crossOrigin = "Anonymous";
      }
      img.src = this.imgs;

      function setCanvasSize(width, height) {
        canvas.width = Math.round(width);
        canvas.height = Math.round(height);
      }
    },

    // 获取转换成base64 的图片信息
    getCropData(cb) {
      this.getCropChecked(data => {
        cb(data.toDataURL("image/" + this.outputType, this.outputSize));
      });
    },

    //canvas获取为blob对象
    getCropBlob(cb) {
      this.getCropChecked(data => {
        data.toBlob(
          blob => cb(blob),
          "image/" + this.outputType,
          this.outputSize
        );
      });
    },

    // 自动预览函数
    showPreview() {
      // 优化不要多次触发
      if (this.isCanShow) {
        this.isCanShow = false;
        setTimeout(() => {
          this.isCanShow = true;
        }, 16);
      } else {
        return false;
      }
      let w = this.cropW;
      let h = this.cropH;
      let scale = this.scale;
      var obj = {};
      obj.div = {
        width: `${w}px`,
        height: `${h}px`
      };
      let transformX = (this.x - this.cropOffsertX) / scale;
      let transformY = (this.y - this.cropOffsertY) / scale;
      let transformZ = 0;
      obj.w = w;
      obj.h = h;
      obj.url = this.imgs;
      obj.img = {
        width: `${this.trueWidth}px`,
        height: `${this.trueHeight}px`,
        transform: `scale(${scale})translate3d(${transformX}px, ${transformY}px, ${transformZ}px)rotateZ(${this
          .rotate * 90}deg)`
      };
      obj.html = `
      <div class="show-preview" style="width: ${obj.w}px; height: ${
        obj.h
      }px,; overflow: hidden">
        <div style="width: ${w}px; height: ${h}px">
          <img src=${obj.url} style="width: ${this.trueWidth}px; height: ${
        this.trueHeight
      }px; transform:
          scale(${scale})translate3d(${transformX}px, ${transformY}px, ${transformZ}px)rotateZ(${this
        .rotate * 90}deg)">
        </div>
      </div>`;
      this.$emit("realTime", obj);
      this.$emit("real-time", obj);
    },
    // reload 图片布局函数
    reload() {
      let img = new Image();
      img.onload = () => {
        // 读取图片的信息原始信息， 解析是否需要旋转
        // 读取图片的旋转信息
        // 得到外层容器的宽度高度
        this.w = parseFloat(window.getComputedStyle(this.$refs.cropper).width);
        this.h = parseFloat(window.getComputedStyle(this.$refs.cropper).height);

        // 存入图片真实高度
        this.trueWidth = img.width;
        this.trueHeight = img.height;

        // 判断是否需要压缩大图
        if (!this.original) {
          // 判断布局方式 mode
          this.scale = this.checkedMode();
        } else {
          this.scale = 1;
        }

        this.$nextTick(() => {
          this.x =
            -(this.trueWidth - this.trueWidth * this.scale) / 2 +
            (this.w - this.trueWidth * this.scale) / 2;
          this.y =
            -(this.trueHeight - this.trueHeight * this.scale) / 2 +
            (this.h - this.trueHeight * this.scale) / 2;
          this.loading = false;
          // // 获取是否开启了自动截图
          if (this.autoCrop) {
            this.goAutoCrop();
          }
          // 图片加载成功的回调
          this.$emit("img-load", "success");
          this.$emit("imgLoad", "success");        
          setTimeout(() => {
            this.showPreview();
          }, 20);
        });
      };
      img.onerror = () => {
        this.$emit("imgLoad", "error");
        this.$emit("img-load", "error");
      };
      img.src = this.imgs;
    },
    // 背景布局的函数
    checkedMode() {
      let scale = 1;
      // 通过字符串分割
      let imgW = this.trueWidth;
      let imgH = this.trueHeight;
      const arr = this.mode.split(" ");
      switch (arr[0]) {
        case "contain":
          if (this.trueWidth > this.w) {
            // 如果图片宽度大于容器宽度
            scale = this.w / this.trueWidth;
          }

          if (this.trueHeight * scale > this.h) {
            scale = this.h / this.trueHeight;
          }
          break;
        case "cover":
          // 扩展布局 默认填充满整个容器
          // 图片宽度大于容器
          imgW = this.w;
          scale = imgW / this.trueWidth;
          imgH = imgH * scale;
          // 如果扩展之后高度小于容器的外层高度 继续扩展高度
          if (imgH < this.h) {
            imgH = this.h;
            scale = imgH / this.trueHeight;
          }
          break;
        default:
          try {
            let str = arr[0];
            if (str.search("px") !== -1) {
              str = str.replace("px", "");
              imgW = parseFloat(str);
              scale = imgW / this.trueWidth;
            }
            if (str.search("%") !== -1) {
              str = str.replace("%", "");
              imgW = (parseFloat(str) / 100) * this.w;
              scale = imgW / this.trueWidth;
            }

            if (arr.length === 2 && str === "auto") {
              let str2 = arr[1];
              if (str2.search("px") !== -1) {
                str2 = str2.replace("px", "");
                imgH = parseFloat(str2);
                scale = imgH / this.trueHeight;
              }
              if (str2.search("%") !== -1) {
                str2 = str2.replace("%", "");
                imgH = (parseFloat(str2) / 100) * this.h;
                scale = imgH / this.trueHeight;
              }
            }
          } catch (error) {
            scale = 1;
          }
      }
      return scale;
    },
    // 自动截图函数
    goAutoCrop(cw, ch) {
      if (this.imgs === '' || this.imgs === null) return
      this.clearCrop();
      this.cropping = true;
      let maxWidth = this.w;
      let maxHeight = this.h;
      if (this.centerBox) {
        let imgW = this.trueWidth * this.scale;
        let imgH = this.trueHeight * this.scale;
        maxWidth = imgW < maxWidth ? imgW : maxWidth;
        maxHeight = imgH < maxHeight ? imgH : maxHeight;
      }
      // 截图框默认大小
      // 如果为0 那么计算容器大小 默认为80%
      var w = cw ? cw : parseFloat(this.autoCropWidth);
      var h = ch ? ch : parseFloat(this.autoCropHeight);
      if (w === 0 || h === 0) {
        w = maxWidth * 0.8;
        h = maxHeight * 0.8;
      }
      w = w > maxWidth ? maxWidth : w;
      h = h > maxHeight ? maxHeight : h;
      if (this.fixed) {
        h = (w / this.fixedNumber[0]) * this.fixedNumber[1];
      }
      // 如果比例之后 高度大于h
      if (h > this.h) {
        h = this.h;
        w = (h / this.fixedNumber[1]) * this.fixedNumber[0];
      }
      this.changeCrop(w, h);
    },
    // 手动改变截图框大小函数
    changeCrop(w, h) {
      if (this.centerBox) {
        // 修复初始化时候在centerBox=true情况下
        let axis = this.getImgAxis();
        if (w > axis.x2 - axis.x1) {
          // 宽度超标
          w = axis.x2 - axis.x1;
          h = (w / this.fixedNumber[0]) * this.fixedNumber[1];
        }
        if (h > axis.y2 - axis.y1) {
          // 高度超标
          h = axis.y2 - axis.y1;
          w = (h / this.fixedNumber[1]) * this.fixedNumber[0];
        }
      }
      // 判断是否大于容器
      this.cropW = w;
      this.cropH = h;
      this.checkCropLimitSize()
      this.$nextTick(() => {
        // 居中走一走
        this.cropOffsertX = (this.w - this.cropW) / 2;
        this.cropOffsertY = (this.h - this.cropH) / 2;
        if (this.centerBox) {
          this.moveCrop(null, true);
        }
      });
    },
    // 重置函数， 恢复组件置初始状态
    refresh() {
      // console.log('refresh')
      let img = this.img;
      this.imgs = "";
      this.scale = 1;
      this.crop = false;
      this.rotate = 0;
      this.w = 0;
      this.h = 0;
      this.trueWidth = 0;
      this.trueHeight = 0;
      this.clearCrop();
      this.$nextTick(() => {
        this.checkedImg();
      });
    },

    // 向左边旋转
    rotateLeft() {
      this.rotate = this.rotate <= -3 ? 0 : this.rotate - 1;
    },

    // 向右边旋转
    rotateRight() {
      this.rotate = this.rotate >= 3 ? 0 : this.rotate + 1;
    },

    // 清除旋转
    rotateClear() {
      this.rotate = 0;
    },

    // 图片坐标点校验
    checkoutImgAxis(x, y, scale) {
      x = x || this.x;
      y = y || this.y;
      scale = scale || this.scale;
      let canGo = true;
      // 开始校验 如果说缩放之后的坐标在截图框外 则阻止缩放
      if (this.centerBox) {
        let axis = this.getImgAxis(x, y, scale);
        let cropAxis = this.getCropAxis();
        // 左边的横坐标 图片不能超过截图框
        if (axis.x1 >= cropAxis.x1) {
          canGo = false;
        }

        // 右边横坐标
        if (axis.x2 <= cropAxis.x2) {
          canGo = false;
        }

        // 纵坐标上面
        if (axis.y1 >= cropAxis.y1) {
          canGo = false;
        }

        // 纵坐标下面
        if (axis.y2 <= cropAxis.y2) {
          canGo = false;
        }
      }
      return canGo;
    }
  },
  mounted() {
    this.support =
      "onwheel" in document.createElement("div")
        ? "wheel"
        : document.onmousewheel !== undefined
        ? "mousewheel"
        : "DOMMouseScroll";
    let that = this;
    var u = navigator.userAgent;
    this.isIOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/);
    // 兼容blob
    if (!HTMLCanvasElement.prototype.toBlob) {
      Object.defineProperty(HTMLCanvasElement.prototype, "toBlob", {
        value: function(callback, type, quality) {
          var binStr = atob(this.toDataURL(type, quality).split(",")[1]),
            len = binStr.length,
            arr = new Uint8Array(len);
          for (var i = 0; i < len; i++) {
            arr[i] = binStr.charCodeAt(i);
          }
          callback(new Blob([arr], { type: that.type || "image/png" }));
        }
      });
    }
    this.showPreview();
    this.checkedImg();
  },
  destroyed() {
    window.removeEventListener("mousemove", this.moveCrop);
    window.removeEventListener("mouseup", this.leaveCrop);
    window.removeEventListener("touchmove", this.moveCrop);
    window.removeEventListener("touchend", this.leaveCrop);
  }
};
</script>

<style scoped lang="css">
.vue-cropper {
  position: relative;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  direction: ltr;
  touch-action: none;
  text-align: left;
  background-image: url("");
}

.cropper-box,
.cropper-box-canvas,
.cropper-drag-box,
.cropper-crop-box,
.cropper-face {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  user-select: none;
}

.cropper-box-canvas img {
  position: relative;
  text-align: left;
  user-select: none;
  transform: none;
  max-width: none;
  max-height: none;
}

.cropper-box {
  overflow: hidden;
}

.cropper-move {
  cursor: move;
}

.cropper-crop {
  cursor: crosshair;
}

.cropper-modal {
  background: rgba(0, 0, 0, 0.5);
}

.cropper-crop-box {
  /*border: 2px solid #39f;*/
}

.cropper-view-box {
  display: block;
  overflow: hidden;
  width: 100%;
  height: 100%;
  outline: 1px solid #39f;
  outline-color: rgba(51, 153, 255, 0.75);
  user-select: none;
}

.cropper-view-box img {
  user-select: none;
  text-align: left;
  max-width: none;
  max-height: none;
}

.cropper-face {
  top: 0;
  left: 0;
  background-color: #fff;
  opacity: 0.1;
}

.crop-info {
  position: absolute;
  left: 0px;
  min-width: 65px;
  text-align: center;
  color: white;
  line-height: 20px;
  background-color: rgba(0, 0, 0, 0.8);
  font-size: 12px;
}

.crop-line {
  position: absolute;
  display: block;
  width: 100%;
  height: 100%;
  opacity: 0.1;
}

.line-w {
  top: -3px;
  left: 0;
  height: 5px;
  cursor: n-resize;
}

.line-a {
  top: 0;
  left: -3px;
  width: 5px;
  cursor: w-resize;
}

.line-s {
  bottom: -3px;
  left: 0;
  height: 5px;
  cursor: s-resize;
}

.line-d {
  top: 0;
  right: -3px;
  width: 5px;
  cursor: e-resize;
}

.crop-point {
  position: absolute;
  width: 8px;
  height: 8px;
  opacity: 0.75;
  background-color: #39f;
  border-radius: 100%;
}

.point1 {
  top: -4px;
  left: -4px;
  cursor: nw-resize;
}

.point2 {
  top: -5px;
  left: 50%;
  margin-left: -3px;
  cursor: n-resize;
}

.point3 {
  top: -4px;
  right: -4px;
  cursor: ne-resize;
}

.point4 {
  top: 50%;
  left: -4px;
  margin-top: -3px;
  cursor: w-resize;
}

.point5 {
  top: 50%;
  right: -4px;
  margin-top: -3px;
  cursor: e-resize;
}

.point6 {
  bottom: -5px;
  left: -4px;
  cursor: sw-resize;
}

.point7 {
  bottom: -5px;
  left: 50%;
  margin-left: -3px;
  cursor: s-resize;
}

.point8 {
  bottom: -5px;
  right: -4px;
  cursor: se-resize;
}

@media screen and (max-width: 500px) {
  .crop-point {
    position: absolute;
    width: 20px;
    height: 20px;
    opacity: 0.45;
    background-color: #39f;
    border-radius: 100%;
  }

  .point1 {
    top: -10px;
    left: -10px;
  }

  .point2,
  .point4,
  .point5,
  .point7 {
    display: none;
  }

  .point3 {
    top: -10px;
    right: -10px;
  }

  .point4 {
    top: 0;
    left: 0;
  }

  .point6 {
    bottom: -10px;
    left: -10px;
  }

  .point8 {
    bottom: -10px;
    right: -10px;
  }
}
</style>
